Human life is meant for cooperating with the whole

Since they are born from different parts of the body of the Supreme

Lord in His gigantic form, all living entities in all parts of the entire

universe are supposed to he eternal servitors of the supreme body. Every

part of our own body, such as the mouth, hands, thighs and legs, is meant

to render service to the whole. That is their constitutional position. In

subhuman life the living entities are not conscious of this

constitutional position, but in the human form of life they are supposed

to know this through the system of the varnas, the social orders.

Srimad Bhagavatam 3.6.34 purport